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/*
** Copyright (c) 2012 The Khronos Group Inc.
**
** Permission is hereby granted, free of charge, to any person obtaining a
** copy of this software and/or associated documentation files (the
** "Materials"), to deal in the Materials without restriction, including
** without limitation the rights to use, copy, modify, merge, publish,
** distribute, sublicense, and/or sell copies of the Materials, and to
** permit persons to whom the Materials are furnished to do so, subject to
** the following conditions:
**
** The above copyright notice and this permission notice shall be included
** in all copies or substantial portions of the Materials.
**
** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
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<link rel="stylesheet" type="text/css" href="../unit.css" />
<script type="application/javascript" src="../unit.js"></script>
<script type="application/javascript" src="../util.js"></script>
<script type="application/javascript" src="../../../js/webgl-test-utils.js"></script>
<script type="application/javascript">
var wtu = WebGLTestUtils;
var defaultImgUrl = "https://get.webgl.org/conformance-resources/opengl_logo.jpg";
var localImgUrl = "../../../resources/opengl_logo.jpg";

Tests.autoinit = false; // Prevents the test from running until the image is loaded

Tests.startUnit = function () {
  var canvas = document.getElementById('gl');
  var gl = wrapGLContext(getGLContext(canvas));
  return [gl];
}

Tests.testReadPixels = function(gl) {
  // we can't know if this is going to fail because of negative width
  // or because the buffer size doesn't match the dimensions.
  assertSomeGLError(gl, "negative width",
      function(){gl.readPixels(0,0,-1,1, gl.RGBA, gl.UNSIGNED_BYTE,
          new Uint8Array(4));});
  assertSomeGLError(gl,  "negative height",
      function(){gl.readPixels(0,0,1,-1, gl.RGBA, gl.UNSIGNED_BYTE,
          new Uint8Array(4));});
  assertOk("negative x",
      function(){gl.readPixels(-1,0,1,1, gl.RGBA, gl.UNSIGNED_BYTE,
          new Uint8Array(4));});
  assertOk("negative y",
      function(){gl.readPixels(0,-1,1,1, gl.RGBA, gl.UNSIGNED_BYTE,
          new Uint8Array(4));});
  assertOk("height > backbuffer height",
      function(){gl.readPixels(0,0,16,17, gl.RGBA, gl.UNSIGNED_BYTE,
          new Uint8Array(16*17*4));});
  assertOk("width > backbuffer width",
      function(){gl.readPixels(0,0,17,16, gl.RGBA, gl.UNSIGNED_BYTE,
          new Uint8Array(17*16*4));});
  assertOk("width, height = 0",
      function(){gl.readPixels(0,0,0,0, gl.RGBA, gl.UNSIGNED_BYTE,
          new Uint8Array(0));});
  // we can't know if this is going to fail because of negative width
  // or because the buffer size doesn't match the dimensions.
  assertSomeGLError(gl, "bad format",
      function(){gl.readPixels(0,0,1,1, gl.FLOAT, gl.UNSIGNED_BYTE,
          new Uint8Array(4*4));});
  // we can't know if this is going to fail because of negative width
  // or because the buffer size doesn't match the dimensions.
  assertSomeGLError(gl, "bad type",
      function(){gl.readPixels(0,0,1,1, gl.ALPHA, gl.FLOAT,
          new Uint8Array(1*4));});
}

Tests.testReadPixelsSOPIMG = function(gl) {
    var img = document.getElementById("i");
    var tex = gl.createTexture();
    gl.bindTexture(gl.TEXTURE_2D, tex);
    // SOP failure
    assertThrowNoGLError(gl, "throw because img is from another domain",
      function(){gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img);});
    gl.bindTexture(gl.TEXTURE_2D, null);
    assertOk("canvas still origin-clean",
      function(){gl.readPixels(0,0,1,1, gl.RGBA, gl.UNSIGNED_BYTE,
          new Uint8Array(4));});
    gl.deleteTexture(tex);
}
Tests.testReadPixelsSOPCanvas = function(gl) {
    var img = document.getElementById("i");
    var c = document.getElementById("c");
    c.getContext("2d").drawImage(img, 0, 0);
    assertFail("canvas throws because not origin clean",
      function(){c.getContext("2d").getImageData(0,0,1,1);});
    var tex = gl.createTexture();
    gl.bindTexture(gl.TEXTURE_2D, tex);
    // SOP failure
    assertThrowNoGLError(gl, "throw because canvas is not origin clean",
      function(){gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, c);});
    gl.bindTexture(gl.TEXTURE_2D, null);
    assertOk("canvas still origin-clean",
      function(){gl.readPixels(0,0,1,1, gl.RGBA, gl.UNSIGNED_BYTE,
          new Uint8Array(4));});
    gl.deleteTexture(tex);
}

Tests.endUnit = function(gl) {
}

wtu.setupImageForCrossOriginTest("#i", defaultImgUrl, localImgUrl, initTests);
</script>
</head><body>
<canvas id="gl" width="16" height="16"></canvas>
<canvas id="c" width="128" height="128"></canvas>
<img id="i">
</body></html>
